答案的确给错!1)这两道题目都是考查强调句型的语法。强调句型的结构如下:It is/was + 被强调部分 + that + 句子中未被强调的其他部分.而且not...until...的强调句型结构是:It is/was not until + 状语/状语从句 + that + 句子/主句(必须还原成肯定句)。2)其最大特点是:去掉It is/was和that之后,剩下部分能构成一个完整的句子(多数时候需要调整句序)。3) 下面分析这两题:1. D此题是not...until的强调句型。去掉It was和that之后,剩下句子是:Not until eleven o'clockhe went to bed.= He didn't go to bed until eleven o'clock.上句正是一个完整而正确的句子。2. C先把该句还原成陈述句即:It was at the school gate that the girl picked up the purse.去掉It was和that之后,即:the girl picked up the purse at the gate.上句也完整而且正确。参考资料:原创回答团(第159号会员)